Answer
Common methods include ACH/BACS/SEPA bank transfers (low cost, most common), wire transfers (fast, high-value, urgent), checks (declining, higher fraud risk), corporate/purchasing cards, and increasingly virtual cards. The choice balances cost, speed, security, supplier acceptance, and any rebate the buyer earns.
Real-world example Routine suppliers are paid by ACH, an urgent overseas payment goes by wire, and low-value tail spend uses a virtual card for rebates.